Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
-
Economics & Finance
Javascript Articles
Page 114 of 534
JavaScript - Sort key value pair object based on value?
By using JavaScript's native array methods and functions, we can easily create custom sorting algorithms that will work for any type of object. In this article, we will discuss how to use these techniques in order to sort an object's key-value pairs by value. A key-value pair in JavaScript such as maps, dictionaries stores one value (the "key") associated with another value (the "value"). It can be used to store and access data quickly, as each element has its own unique identifier. For sorting key value pair object based on the value, we use sort() method in JavaScript. ...
Read MoreSet PIN validation with JavaScript?
In this article, we will discuss how to set up PIN validation using JavaScript. We will cover creating prompts for users to enter their PIN number, validating input against stored values, and returning appropriate responses based on the validation result. Data validation is the procedure used to ensure that user input is accurate, reliable, and clean. PIN validation typically checks the length, format, and data type to ensure the PIN contains only digits and meets specific requirements. We can validate PINs based on length (usually 4 or 6 digits) and ensure the input contains only numeric characters. Let's ...
Read MoreDynamically replace data based on matched RegEx - JavaScript?
Regex (Regular Expressions) is used to match patterns in strings of text. With JavaScript, you can use regex to dynamically replace data based on matched patterns using the replace() method. This article will explain how to use regex and JavaScript together to make dynamic replacements in your code. We'll cover the basics of regex syntax and practical examples for template replacement. Using replace() Method The replace() method in JavaScript searches a string for a specified value or regular expression and returns a new string with replacements. The original string remains unchanged. Syntax string.replace(searchValue, newValue) ...
Read MoreInsert a new CSS rule while working on JavaScript?
Adding a new CSS rule can help to create the desired look and feel for your web page or application. This article will explain how to insert a new CSS rule while working on JavaScript. It will provide step-by-step instructions on how to write and apply the necessary code in order to achieve the desired result. Additionally, we will also discuss some of the potential problems that may arise when inserting a new CSS rule into an existing project. The style sheet language known as CSS (cascading style sheets), is used to shape the HTML elements that will ...
Read MoreMultiply only specific value in a JavaScript object?
The ability to multiply only specific values in a JavaScript object can be a useful tool for performing calculations or making modifications to data. By using methods like map(), forEach(), and traditional loops, you can efficiently target and modify values that meet certain criteria. An object in JavaScript is a separate entity having properties and a type. This article demonstrates various approaches to selectively multiply values within objects and arrays. Method 1: Using Array.map() to Transform Object Properties In this example, we multiply the value property of each object in an array by 3: ...
Read MoreDelete all text up to a character in a URL- JavaScript?
This article explains how to use JavaScript's replace() method with regular expressions to delete all text up to a specific character in a URL. This technique is useful for extracting filenames, removing domain information, or cleaning URL strings. A regular expression (RegExp) is a pattern used to match character combinations in strings. In JavaScript, regular expressions are objects with properties and methods for pattern matching and text manipulation. The replace() Method The replace() method searches for a value or regular expression pattern in a string and returns a new string with the matched content replaced. The original ...
Read MoreValidate Tutorialspoint URL via JavaScript regex?
To validate a TutorialsPoint URL using JavaScript, you can use regular expressions to check if the URL matches the expected domain pattern and extract specific parts of the URL. Regular Expression Pattern The regex pattern /^https?:\/\/(tutorialspoint\.com)\/(.*)$/ breaks down as follows: ^ - Start of string https? - Matches "http" or "https" :\/\/ - Matches "://" (tutorialspoint\.com) - Captures the domain (escaped dot) \/ - Matches forward slash (.*)$ - Captures everything after the domain until end of string Example function validateTutorialspointURL(myURL) { var regularExpression = /^https?:\/\/(tutorialspoint\.com)\/(.*)$/; ...
Read MoreConvert set to object - JavaScript?
The task we are going to perform in this article is converting a JavaScript Set to an object. Before we jump into the methods, let's have a quick overview of Sets and objects in JavaScript. A JavaScript Set is a collection of unique values where each value can only appear once. An object in JavaScript is a data structure with properties and values, similar to a dictionary or map. Converting Sets to objects is useful when you need to work with key-value pairs instead of just values. There are several methods to convert a Set to an object ...
Read MoreJavaScript - Accept only numbers between 0 to 255 range?
In JavaScript, validating user input to accept only numbers within a specific range is a common requirement. This is particularly useful for form validation, color values (RGB components), or any scenario where you need to ensure numeric input falls within defined bounds. In this article, we will explore different methods to accept only numbers between 0 and 255 range using JavaScript. This range is commonly used for RGB color values, where each color component must be between 0 and 255. Using if else Condition The if/else statement executes a block of code when a condition is true, ...
Read MoreHow to define custom sort function in JavaScript?
Creating custom sort functions in JavaScript allows you to control exactly how array elements are ordered. By defining a custom sort function, you can sort elements in specific ways that go beyond the default string-based sorting behavior. This article will explain how to define custom sort functions in JavaScript, provide practical examples, and show different sorting techniques. Understanding the Default sort() Behavior By default, the sort() method converts elements to strings and compares them lexicographically. This can lead to unexpected results with numbers: ...
Read More